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Reports uses of <code>Optional.ofNullable()</code> where always null or always not-null argument is passed.
There's no point in using <code>Optional.ofNullable()</code> in this case: either <code>Optional.empty()</code>
or <code>Optional.of()</code> should be used to explicitly state the intent of creating an always-empty
or always non-empty optional respectively. It's also possible that there's a mistake in 
<code>Optional.ofNullable()</code> argument, so it should be examined.
<p>
  Example:
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<pre><code>
Optional&lt;String&gt; empty = Optional.ofNullable(null); // should be Optional.empty();
Optional&lt;String&gt; present = Optional.ofNullable("value"); // should be Optional.of("value"); 
</code></pre>
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